418 



DR. C. F. SONNTAG ON THE ANATOMY, 



tend to coalesce in short, i-egular lines. The mednlla is con- 

 tinuous, homogeneous, and densely pigmented. The hair shaft 

 is cylindrical. (PI. III. fig. A.) 



A transverse section of the skin, passing across a hair- 

 follicle, shows the thick outer and inner root-sheath, with the 

 layers of Henle, and of Huxley, both well developed ; while the 

 mass of elastic tissue closely surrounding the hair-follicles 

 presents a very striking appearance (PI. III. figs. B and C). 



Pathology. 



Nothing is known of the diseases to which the Chimpanzee 

 is subject in its native surroundings. In captivity in Europe it 

 usually succumbs to diseases of the respiratory or digestive 

 organs. Some animals die from generalised tuberculosis, or from 

 osseous and arthritic changes after many years in confinement. 

 The following table, compiled from the death reports, shows the 

 causes of death and duration of life of animals which have been 

 in the Society's Gardens since 1882. 



* Authority J. B. Sutton. 



